Press



Jan. 27, 1942. E. RIEMENSCHNEIDER 2,270,968

PRESS Filed July 20, 1959 INVENTOR.

EEA/EfiT flanfA/sc/wf/pae ATTORNEY.

Patented Jan. 27, 1942 7;. v.

Signor to The Midland Steel Products gem-- pany, Cleveland, Qhio, acorporation ofvqh o I I :ApplicationJuly 20, -1939,Serial Nd.l2815,54-2

ibC1aimsf.-9{011192- 82} I p v a erator'fand in order to convert -thepress into a This invention relatesto new a.n- :ljusefi'i1im-',

proveinentsin presses and an important object of the invention is toprovide a simple, sturdy and efiicient safety "attachment forconverting: a continuous operating pressinto a single stroke pressto'pr'evnt carelessness of the operator" unintentionally causing arepeat stroke of I the press f Other objects and advantages of theinvention will become apparent during the course of the fol'-' lowingdescription. 7 x v v,

" In-ythe accompanying "drawing forming-a part of the application andwherein like numerals are employedto designate like parts throughout theseveral views, v I

Fig. 1 is a perspective view of ,apress with the single strokeattachment applied thereto; r 'Fig. 2 is afragm-entary' side elevationof a portion of the press showingthe usual clutch latch engaging aclutch operator to'normally holdthe,

clutch disengaged,

Fig. 3 is an end view'of a portion of asingle stroke attachment,

Fig. 4 is a side elevation of the same in cocked position,- j

Fig; 5 .is a similar view showing the device in uncooked position. p vReferring to the drawing and detail, the numer'al l designates the standor frame of a press having the usual bed 2, slide 3, crank or drivenshaft 4, drive wheel 5, clutch 6. clutch operating latch l and operatingtreadle 8. The crankshaft is provided. with the usual friction brake,not shown. Theclutch 6 is provided with the usual pin or pawl operator 9which is normally pro jectecl into the path of the latch 1 andis engagedthereby to disengage the clutch so that the drive-1 wheel 5 rotatesindependently of the crankshaftl when the tread1e8 is elevated. When thelatch. l is swung out of-the path of movement of the" operator: 9 bydepressing the pedal 8,.the operator 9 projects itself :outwardlycausing engage ment ofthe clutch to couple the drivewheel with thcrankshaft; and when the latch l is returned into the path of movementof the operator, the

operator again engages the latch upon a complete revolution of thedrivewheel 5,- the clutch is automatically disengaged to disconnect thelong as the treadle 8 is held depressed by the op- I single strokeoperation and as a safety factor sothatthe press-will not repeat whenthe operator unintentionally-holds the treadle Bfdepres' S'ed; a"non-repeat deviceisinstalled'so as-to automati callycause thelatchl tomove back into position to 'eng'age theclutch'o-perator 9 as soon-as thetreadle 8 is depressed, whereby the-clutch will I 'again elevated toitsnor'mal position, which resets the mechanism to cause engagement ofthe clutch uponthe next depression of the treadle. The clutch latch issecured to the'usual operating shaft I0 which is turned by' an arm ll.This-latch mechanism is a standard part of Bliss pressesand the clutch 6may be'the usual Bliss rolling keyclutch or any other type whichwill benormally disengaged by the latch mechanism]. A-treadlelever I2 isconnected to the treadle shaft H in the usual mannerjand inthe ordinarycontinuous press control;a'ro'd-connects this leverf I? with the arm I Ifor operating thelatch I.

1 The present invention contemplates a two piece rod in place of thecustomaryone-piece rod; one of the'r'od sections being'designated bythenumeral Hand the other by'the'numeraHB; The

upper ro dsection" I5 is pivotally connected with the arm I I and passesthrough a guide 16 forming a seat for a compression coil spring I! heldcompressed'u'pon its seat by an 'abutment I8 securedto the sectionso'th'at when this section I5 is'released to'the' spring H; the latch 1is placed in the path of movement of the clutch operator 9 todisengagetheclutch; The two rod sections T4 and l 5 are connected withan extensible break joint device l9 which is composed of a lower section20 and an upper section Zlpivotally connectedto lower and upper rodsections l4 and I5 the trigger 22 arranged in substantially horizon-,

tal position the hooked upper end of lower section 20 carrying thefulcrum pivot 23 is nested in abutment with the crotch of the upperhooked lower end of sectiontl; to maintain the pivot 23 disposed abovepivot 24 with its center in alignmentin aline drawn between centers ofpivots 25 and 26 which pivotally connect the rod sections I 4 and ISwith a break joint. With this relation, the center of the lower pivot 24is disposed in an ofi center position slightly out'of line with astraight line drawn through the pivots 25, 23 and 26 whereby the breakjoint will transclutch to become engaged to drive the crankshaft 4, andthen will immediately snap back to clutch disengaging position under theinfluence of spring I1. 1

In order to break this joint 'to permit the upper section IE to be movedupwardly under the influence of spring I! to return thel-atch I toclutch disengaging position to engage the clutch operator 9 when thewheel 5 has made a com-' plete revolution, a positiveacting tripmechanism is provided to depress the trigger 22 for swinging the pivot23 over dead-center and for breaking the joint upon initial turningmovement of the crankshaft 4. The break joint is held in the straightline pull position by means of a spring 21 connected to the angle of thebellcrank trigger 22 soas to normally hold and urge the pivots 23 and 24to the position shown inFig. 4. The upper section 2| ofthe break jointis guided through a suitable uide 28 extending from a T- shaped mountingplate-29 secured to the side of the press as illustrated. The trip 30 iscarried by the lower end of a trip rod guided vertically in apair ofguides 31 and between which a coiled compression spring 32 is mountedupon the rod and engages an. abutment 33 for normally urging the triprod 34'upwardly with the trip abutting the lower guide directly abovethe trigger 22. The upper end of trip rod 34 is pivotally connected to alever 35 which has its free end arranged in the path of movement of alug formed on a collar secured to the crank shaft, so that upon initialturning of the crankshaft, the trip 30 is depressed to overtake and kickth trigger 22 down to break the joint'in the treadle operated rod to theposition shown in Fig. 5 so that the treadle 8 can remain depressedwhile the upper section l5 of the rod springs back to normal positionand restores the latch to a position to disengage the clutch uponnearing the completion of one rotation of the driver 5 and crankshaft 4to prevent a repeat stroke of th press. The press cannot operate againuntil the operator intentionally and deliberately permits the treadle tobecome elevated to its normal position thereby permitting the trigger 22and break joint to be restored to the position shown in Figs. 1 and 4,ready to be tripped again when the treadle is again depressed to operatethe press.

Various changes in the shape and arrangement of parts may be resorted toWithout departing from th scope of the appended claims.

I claim:

l. A nonrepeat device for presses including a pair of relatively movablemembers having identical hook-shape ends, said members being normallymovable as a unit in one direction when in substantially longitudinalalignment withtheir hooked ends nested and inter-engaging, one of saidmembers being slidable and the other swingable, spring means normallyurging said slidable member lengthwise of the swingable member, and atrigger pivoted at one end to the slidable member and pivotallyconnected at its elbow to the swingable member to engage and disengagethe hooked ends of said members.

2. A nonrepeat device for presses including a pair of relatively movablenormally aligned members movable in one direction as a unit whenaligned, spring means normally urging one of said members in theopposite direction, said spring urged member. having an abutment and theother member being pivotally mounted, a trigger havin a pivot connectedto said spring urged member and a second pivot connected to thepivotally mounted member, spring means connected to said trigger forn-ormally urging it to position with one of its pivots in substantialalignment with said members and against the abutment of the spring urgedmember, and

means for swinging the trigger to swing its pivot out of substantialalignment with said members to release the spring urged member toindependent movement. l

aligned, spring means normally urging one or said members in theopposite direction, said spring urged member having an abutment, abellcrank trigger having a pivot connected to said spring urged memberand its fulcrum pivot connected to said pivoted member and normallyengaged with said abutment to retain said pivots on one side of deadcenter, and means for swinging this trigger to move its fulcrum pivotout of alignment with said members to release the spring urged member tomovement independent of that of the other member.

4. A nonrepeat device for presses including a pair of relatively movablemembers normally movable in one direction as a unit, spring meansnormally urging one of said members in the opposite direction, a triggerpivotally connected to said spring urged member and also pivotallyconnected to said other member whereby a pull on said latter member willmove the spring urged member against the tension ofsaid spring means,and means for swinging the trigger relative to said spring urged memberto release said member to be moved by said spring means in a directionopposite to the movement of said other member.

' 5. A nonrepeat device for presses including a pair of relativelymovable members normally movable in one direction as a unit, springmeans normally urging one of said members in the 0pposite direction, atrigger pivotally connected to both of said members whereby a pull onone member will move the other member in the same direction, and meansfor swinging said trigger relative to said members to enable said springurged member to move in the opposite direction while the other member isbeing moved in the first named direction, and spring means for remembersand normally capable of transmitting a straight line pull to engage theclutch as the treadle is being depressed, said break joint m'- eluding atrigger pivotally connected to both of said members, and a tripmechanism operated by the driven shaft and adapted to engage saidtrigger to break the joint whereby said members move relatively toengage the clutch while the treadle is being depressed, and said triggerand break joint between the members being re-established to normalposition when the treadle is elevated.

7. A device of the class described comprising a pair of relativelymovable members normally movable in one direction as a unit whensubstantially aligned and capable of moving relatively in oppositedirections when mis-aligned, and a link having pivots connected to saidmembers, whereby when the link is turned the pivots are disposed insubstantial alignment with the members so that a pull lengthwise uponone member will cause both members to move as a unit, and when the linkis turned in the opposite direction the pivots are mis-aligned with saidmembers, the latter move relatively.

8. A device of the class described comprising a pair of relativelymovable members normally movable in one direction as a unit whensubstantially aligned and capable of moving relatively'in oppositedirections when mis-aligned, each of said members having correspondinghooked bifurcated ends, said members being arranged in opposed relationwith one inverted with respect to the other, and a bellcrank having anangular end arranged in the bifurcations of the hooked ends with itselbow connected by a pivot to one member and its free end connected by asecond pivot to the other member, whereby when the bellcrank is turnedthe pivots are disposed in substantial alignment with the members, thehooked ends will be nested in and will abut the crotches of the hooks sothat a pull lengthwise upon one member will cause both members to moveas a unit, and when the bellcrank is turned in the opposite directionthe pivots are mis-aligned with said members, the latter moverelatively.

9. A nonrepeat device for presses and the like including a pair ofrelatively movable normally aligned members movable in one direction asa unit when aligned, spring means normally urging one of said members inthe opposite direction, one of said members being pivotally mounted, anda movable trigger having a pivot connected to said spring urgedmemberand a second pivot connected to the pivotally mounted member, saidpivots when arranged in alignment with said members causing them to moveas a unit, and when mis-aligned with the members releases the springurged member to independent movement.

10. A nonrepeat device for presses and the like including a pair ofrelatively movable normally aligned members movable in one direction asa unit when aligned, spring means normally urging one of said members inthe opposite direction,'

one of said members being pivotally mounted, and a bellcrank triggerhaving its fulcrum pivot connected to the pivotally mounted member and.a second pivot on its working end connected to said spring urged member,said trigger having a lever arm extending laterally of said members,said pivots when arranged in alignment with said members causing them tomove as a unit when the pivotally mounted member is moved in arectilinear path longitudinally ofthe aligned members, and when saidpivots are mis-aligned with the members, the spring urged member ismoved independently of the other member.

ERNEST RIEMENSCHNEIDER.

